JP2007204003A - Safety device for platform door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for a platform door capable of correctly discriminating presence/absence of incoming and outgoing passengers on a passage when a slide door of the platform door is opened while reducing the installation number of sensors. <P>SOLUTION: The safety device 10 of the platform door discriminates presence/absence of incoming and outgoing passengers in a getting-on/getting-off passage 9 between a train traveling passage 3 at the end of the getting-on/getting-off passage and a platform door 2, and has a distance surveying sensor 11 which scans the light over a floor surface of the passage 9 by a flooding mirror, receives the reflected light from a scanning area X, and detects the distance to a reflecting part. The distance surveying sensor 11 detects the measured distance obtained when receiving the reflected light from the scanning area X with the surveyed distance to the reference line Y formed on the floor surface of the passage 9 by the scanning as the reference value, and discriminates presence/absence of any incoming and outgoing passengers based on the difference between the measurement distance detected by the distance surveying sensor 11 and the reference value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a platform door safety device provided on a platform, and more particularly, to a platform door safety device for detecting passengers present in a boarding passage between a platform door and an end of the platform.

  In recent years, a platform door may be installed at a railway station to ensure the safety of passengers on the platform. The platform door is provided with a fixed wall that is erected at a position recessed by a predetermined distance from the end of the platform on the side of the train traveling path to the opposite side of the train traveling path and that extends along the longitudinal direction of the platform. The fixed wall is provided with an opening at a position corresponding to each door for getting on and off the train stopped on the platform. Each opening is provided with a slide door that opens and closes each opening. Then, the train enters the platform, stops at a predetermined stop position, and the train entrance / exit door and the platform door slide are opened. Passengers get in and out of the train from the opened opening through the entrance / exit passage between the platform door and the train travel path and through the entrance / exit door of the train. When the boarding / alighting of passengers is completed, the train doors and the platform door slide doors are closed.

  However, when both the train door and the platform door slide door are closed, passengers may be left between the platform door and the train, that is, in the boarding passage. It was insufficient to secure

  Therefore, for example, as disclosed in Patent Document 1 below, a safety device is usually attached to the platform door. The safety device disclosed in this document is mounted with a light projecting unit fixed to one end side of the opening of the platform door and a light receiving unit fixed to the other end side, and the light projecting unit to the light receiving unit. It is configured to determine that there is a passenger when the light path of the light up to is interrupted. However, according to such a configuration, since the range in which the presence / absence of passengers can be determined is narrow per sensor composed of the light projecting unit and the light receiving unit described above, it is possible to accurately detect the passengers present in the passenger passage. Requires a large number of sensors to be arranged in the opening of the platform door. As a result, a problem of securing a space for installing a plurality of sensors may arise, and a new problem may occur that increases the labor burden on the operator required for the sensor maintenance work or increases the cost. .

  As a countermeasure against this problem, for example, there is a platform door safety device disclosed in Patent Document 2 below. The safety device disclosed in this document is equipped with a slide door that opens and closes the opening of the platform door, and a distance measuring sensor with an optical axis fixed to the end of the train and the entrance / exit for the door. Along with this, the optical axis of the fixed distance measuring sensor is scanned in the opening / closing direction of the sliding door to determine whether or not there is a passenger in the boarding / exiting passage. Therefore, according to such a configuration, the range in which the presence / absence of passengers can be determined for each distance measuring sensor is expanded according to the opening / closing width of the sliding door. It is possible to determine whether there are passengers in the service passage.

JP 2002-37056 A JP 2004-182077 A

  By the way, in this kind of platform door, in order to ensure the safety of passengers, it is important to close the opening with the slide door in a state where no passengers are present in the passenger passage. Therefore, in addition to reducing the number of sensors installed in the platform door safety device, the platform door safety device is configured to accurately determine whether there is a passenger in the boarding / exiting passage even when the sliding door is open. It is required to be.

  However, according to the safety device disclosed in Patent Document 2, the number of sensors installed can be reduced as described above. It is impossible to judge the existence of For this reason, even when there are passengers in the boarding / alighting passage, there is a problem that the sliding door is inevitably closed once, and the above request cannot be met accurately.

  It is an object of the present invention to reduce the number of installed sensors, and whether or not there are passengers in the boarding / alighting path between the train travel path and the platform door even when the sliding door of the platform door is opened. It is an object of the present invention to provide a platform door safety device that can be accurately judged.

  In order to solve the above problems, the present invention provides a platform door safety device for determining whether or not there is a passenger in a boarding passage between a platform door provided on the platform and an end of the platform. A distance measuring sensor that scans light at a fixed position on the floor surface of the boarding passage and receives reflected light from the scanned area and detects a distance to the reflected portion; The distance sensor detects the measurement distance obtained when the reflected light from the scanned area is received with the measurement distance to the reference line formed on the floor surface of the boarding passage as a reference distance by the scanning. In addition, the present invention is characterized in that the presence / absence of the passenger is determined based on the difference between the measurement distance detected by the distance measuring sensor and the reference distance. In addition, the reference line here may be formed linearly on the floor surface of the boarding passage as described later, or may be formed in a curved line shape (for example, an arc shape or an elliptical arc shape). included.

  According to the above configuration, by scanning light at a fixed position, the light from the distance measuring sensor is scanned on the floor surface of the passenger passage regardless of the opening / closing operation of the slide door of the platform door. Therefore, even if the sliding door is opened, light can be scanned on the floor surface of the boarding / alighting passage using the distance measuring sensor. The safety device as a whole is configured to determine whether passengers are present based on the difference between the measurement distance detected by the distance measuring sensor and the reference distance. Therefore, when light is scanned by the distance measuring sensor in a state where the slide door is opened, it is possible to accurately determine the presence or absence of passengers within the scanned range of light from the distance measuring sensor to the reference line. It becomes possible. Further, since the distance measuring sensor is configured to scan light at a fixed position, light is scanned over a wide range in the getting-on / off passage by one distance measuring sensor. Therefore, even with a small number of distance measuring sensors, it is possible to accurately determine whether passengers are present. The reason why the distance measuring sensor sets the measurement distance to the floor surface of the getting-on / off passage as the reference distance is that the getting-on / off passage is invariable and is stable as a reflection portion. .

  In the above configuration, the distance measuring sensor may include a rotating mirror that scans light on a floor surface of the getting-on / off passage.

  In this way, light scanning at a fixed position by the distance measuring sensor can be realized easily and reliably.

  In the above configuration, the reference line may be formed at an end portion of the getting-on / off passage, and the distance measuring sensor may be arranged closer to the platform door than the reference line.

  In this way, the light is scanned three-dimensionally from the distance measuring sensor toward the end of the boarding passage on the side of the train traveling path, so that it is possible to more accurately determine the presence or absence of passengers.

  Further, in the above configuration, the reference line is formed on a platform gap adjusting member that closes a gap between the getting-on / off passage and the train, and the distance measuring sensor is disposed on the platform door side with respect to the reference line. You may do it.

  If it does in this way, since the edge part of the boarding path will become the edge part by the side of the train of a platform clearance adjusting member, the above-mentioned effect can be obtained similarly.

  In the above configuration, the distance measuring sensor is arranged such that a light scanning plane is inclined with respect to a floor surface of the boarding passage, and the reference line is placed on the floor surface of the boarding passage in the longitudinal direction of the platform. It may be formed linearly along the direction.

  If it does in this way, the light will be scanned linearly along the longitudinal direction of the platform on the floor surface of the passage for getting on and off. Therefore, for example, when the reference line is formed at the end of the passage for getting on and off as described above or the end of the platform clearance adjusting member on the train side, the light can be accurately scanned along the end. It becomes possible. If the distance measuring sensor includes a rotating mirror as described above, for example, the distance measuring sensor scans light on a plane perpendicular to the rotating axis of the rotating mirror, and the rotating axis is used for getting on and off. If it is arranged so as to be inclined with respect to the direction orthogonal to the floor surface of the passage, the reference line can be easily formed linearly along the longitudinal direction of the platform on the floor surface of the passenger passage.

  In the above configuration, a warning signal may be output when it is determined that the passenger is present based on the difference between the measurement distance detected by the distance sensor and the reference distance. .

  If it does in this way, it will become possible to notify the driver of a train, the manager of a station, etc. of existence of a passenger in a boarding / alighting passage by a warning signal, for example.

  As described above, according to the present invention, since the light is scanned on the floor surface of the boarding passage at a fixed position by the distance measuring sensor, even if the sliding door of the platform door is opened, It is possible to accurately determine the presence or absence of passengers in the passage. In addition, the distance measuring sensor itself is configured to scan light at a fixed position, and a single distance measuring sensor can scan light over a wide range of the getting-on / off path, so a small number of distance measuring It is possible to accurately determine the presence / absence of passengers in the passage for getting on / off by the sensor.

  Hereinafter, a platform door safety device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view illustrating a schematic configuration of a platform door. As shown in the figure, the platform door 2 provided on the platform 1 of the station is located at a position recessed from the end of the platform 1 on the side of the train traveling path 3 by a predetermined distance on the opposite side of the train traveling path 3. A fixed wall 4 is provided standing in the direction. The fixed wall 4 is provided with openings 5 at predetermined intervals. Each opening 5 is provided with a pair of sliding doors 6 and 6 for opening and closing the opening 5.

  As shown in FIGS. 1 and 2, when the train 7 stops on the platform 1 and the entrance door (not shown) of the train 7 is opened, the sliding doors 6 and 6 are slid in the directions away from each other. 5 is opened, and passengers 8 can get on and off the train 7 by crossing the passage 9 for getting on and off between the platform door 2 and the train traveling path 3 from the opening 5. On the other hand, when the boarding / alighting of the passenger 8 on the train 7 is completed, the boarding / alighting door of the train 7 is closed, and then the sliding doors 6 and 6 are slid in the approaching direction to close the opening 5. In addition, each opening part 5 is provided in the position corresponding to each door for getting on / off of the train 7 stopped at the predetermined stop position of the platform 1.

  In the platform door 2 configured in this manner, when the sliding doors 6 and 6 are slid in the approaching direction and the opening 5 is closed as described above, the passenger 8 is left in the passenger passage 9. In order to prevent the situation, the platform door safety device 10 according to the present embodiment is attached. The safety device 10 includes a distance measuring sensor 11 attached to the wall surface of the fixed wall 4 on the side of the entrance / exit passage 9 as a main component. The distance measuring sensor 11 scans light on the floor surface of the entrance / exit passage 9 around the rotation axis W and reflects the light from within the scanning region X by a light projection mirror 14 (see FIG. 2) described later. The light is received and the distance to the reflection part is detected.

  More specifically, the distance measuring sensor 11 is formed on the floor surface by scanning light in a straight line along the longitudinal direction of the platform 1 on the end portion 9a of the boarding passage 9 on the train traveling path 3 side. The measurement distance obtained when the reflected light from the scanning region X is received is detected using the measurement distance to the reference line Y as a reference distance. The reference line Y is formed to have the same width as the opening 5, preferably longer than the width of the opening 5. The “end portion 9 a” here includes not only the end edge of the platform 1 but also the vicinity of the end edge on the platform 1.

  Next, a specific configuration of the safety device 10 according to the present embodiment will be described based on FIG.

  As shown in FIG. 3, the distance measuring sensor 11 used in the safety device 10 includes a light projecting unit 12, a light receiving unit 13 arranged to face the light projecting unit 12, a light projecting unit 12, and a light receiving unit. The light projecting mirror 14 and the light receiving mirror 15 disposed so as to be interposed between the light projecting mirror 13, the rotating body 16 to which the light projecting mirror 14 and the light receiving mirror 15 are attached, and the light receiving unit 13. A distance calculation unit 17 that calculates the distance to the reflection part based on the light and a rotation position detection unit 18 that detects the rotation position of the projection mirror 14. Further, although not shown, the distance measuring sensor 11 is covered at the outermost part by a housing having a part capable of transmitting light.

  The light projecting unit 12 is disposed so as to emit light downward in FIG. 3. For example, a light emitting diode (LED), a semiconductor laser (LD), or the like is used as a light source. On the optical axis of the light emitted from the light projecting unit 12, an optical lens 19 for making the light beam diameter constant is disposed.

  The rotator 16 is driven by a drive unit 20 connected to the lower end of the peripheral wall 16a around the optical axis Z (corresponding to the rotation axis W in FIG. 1) of light emitted downward from the light projecting unit 12. , Rotated in one direction or oscillated to reciprocate within a predetermined angle range. The rotating body 16 includes a cylindrical peripheral wall portion 16a and a top plate portion 16b that closes an upper end opening of the peripheral wall portion 16a. A light receiving window 16c is formed in the peripheral wall portion 16a, and a light receiving lens 21 having an optical axis aligned in the radial direction of the rotating body 16 is attached to the light receiving window 16c. In FIG. 2, reference numeral 22 denotes a bearing that rotatably supports the rotating body 16, and 20 a and 20 b denote magnets and coils that constitute the drive unit 20, respectively.

  The rotating body 16 faces the light projecting section 12 on a virtual extension line of the optical axis Z of light emitted downward from the light projecting section 12 while being separated from the inner peripheral surface of the rotating body 16. As shown in FIG. The light receiving unit 13 is configured by an optical sensor such as a photodiode, for example, and the light receiving lens 21 is focused on the light receiving unit 13.

  At the center position of the top and bottom surfaces of the top plate portion 16b of the rotator 16, the light projection mirror 14 that reflects the light from the light projecting portion 12 toward the scanning region X and the reflected light from the object in the scanning region X are reflected. A light receiving mirror 15 that reflects toward the light receiving unit 13 is attached. Each of the light projecting mirror 14 and the light receiving mirror 15 is approximately about the upper and lower surfaces of the top plate portion 16b so that the mutual interval widens as it moves from one end of the rotating body 16 in the radial direction to the other end. It is attached in a state where it is inclined 45 degrees. The light emitted downward from the light projecting unit 12 is incident on the light projecting mirror 14 at an incident angle of about 45 degrees, and then is projected by the light projecting mirror 14 on the rotation axis of the light projecting mirror 14. The light is reflected on a plane (scanning region X) orthogonal to an optical axis Z. On the other hand, the light that has passed through the light receiving lens 21 of the rotating body 16 and is introduced into the rotating body 16 is incident on the light receiving mirror 15 at an incident angle of about 45 degrees, and is then reflected downward by the light receiving mirror 15. Then, it enters the light receiving unit 13. Therefore, as described above, the distance measuring sensor 11 configured as described above is disposed so that the rotation axis W is inclined with respect to the direction orthogonal to the floor surface of the passenger passage 9 as shown in FIG. As described above, the reference line Y formed at the end portion 9 a of the getting-on / off passage 9 can be formed linearly along the longitudinal direction of the platform 1.

  On the other hand, the distance calculation unit 17 of the distance measuring sensor 11 is connected to the light projecting unit 12 through the signal line 23 and is connected to the light receiving unit 13 through the signal line 24 and is emitted from the light projecting unit 12. The distance from the distance measuring sensor 11 to the reflection portion is calculated based on the received light and the light received by the light receiving unit 13. On the other hand, in the present embodiment, the rotational position detector 18 includes a slit plate 18a having an optical slit fixed to the outer peripheral surface of the rotating body 16, and a photo interrupter 18b disposed on the rotational path of the slit plate 18a. It is configured. The photo interrupter 18b is connected to the distance calculation unit 17 via the signal line 25, and the rotation position information of the rotating body 16, that is, the light projection mirror 14 detected by the photo interrupter 18b is input to the distance calculation unit 17. It has become so. The distance calculation unit 17 can detect the position of the object in the scanning region X by combining the calculated distance to the object and the input rotational position information of the projection mirror 14. As a distance calculation method of the distance calculation unit 17, for example, a time difference between light projection and reception between light emitted from the light projecting unit 12 and light received by the light receiving unit 13 by modulating the intensity of light in a pulse shape. The TOF method for determining the distance from the light, the intensity of the light at a certain frequency, and the modulation signal component of the light emitted from the light projecting unit 12 and the modulation signal component of the light received by the light receiving unit 13 The AM method for obtaining the distance from the phase difference, or the FM for obtaining the distance from the frequency signal of the interference light between the light emitted from the light projecting unit 12 and the light received by the light receiving unit 13 by modulating the wavelength of the light in the form of a triangular wave. -CW method or the like can be applied.

  In addition to the distance measuring sensor 11 configured as described above, the safety device 10 further includes a control unit 27 connected to the distance calculation unit 17 of the distance measuring sensor 11 via a signal line 26. In the control unit 27, a measurement distance to the reference line Y measured by the distance measuring sensor 11 is stored in advance as a reference distance. Here, when the reference line Y is formed in a straight line, the reference distance from the distance measuring sensor 11 to the reference line Y is not always constant. The reference distance corresponding to the rotational position is stored together. Then, the control unit 27 determines that the passenger 8 is present in the scanning region X when the measured distance detected by the distance measuring sensor 11 is different from the previously stored reference distance, and when both are the same, It is configured to determine that there is no passenger 8 in the scanning region X. Further, the control unit 27 outputs a warning signal when it is determined that the passenger 8 is present.

  The operation of the platform door safety device 10 configured as described above according to the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 1 and FIG. 2, when the train 7 stops at a predetermined position with respect to the platform 1 and the entry / exit door of the train 7 is opened, the slide doors 6 and 6 of the platform door 2 slide in a direction away from each other. Then, the opening 5 is opened, and the passenger 8 gets on and off the train 7 from the opening 5 through the getting-on / off passage 9 between the platform door 2 and the train travel path 3. Thereafter, when the passenger 8 gets on and off the train 7, the distance sensor 11 scans the light along the end portion 9 a of the boarding passage 9 with the opening 5 opened.

  At this time, when the passenger 8 is present in the getting-on / off passage 9, the light emitted from the distance measuring sensor 11 in the area where the passenger 8 is present in the scanning region X is the reference line. Reflected by passenger 8 before reaching Y. Therefore, the measurement distance detected by the distance measuring sensor 11 is a value smaller than the reference distance, for example. In this case, as shown in FIG. 3, the control unit 27 of the safety device 10 determines that the measured distance detected by the distance measuring sensor 11 is different from the reference distance stored in advance, and the inside of the scanning region X It is determined that there is a passenger 8 in At the same time, the control unit 27 outputs a warning signal to notify the driver of the train 7 or the manager of the station that the passenger 8 is present. Further, while the warning signal is output in this way, the slide doors 6 and 6 are maintained in a stopped state, and the opening 5 is opened.

  Thereafter, when the control unit 27 determines that the passenger 8 does not exist in the scanning region X by scanning light with the distance measuring sensor 11, the warning signal from the control unit 27 is canceled and the train 7 is illustrated. The entrance / exit door that is not to be closed is closed, and then the sliding doors 6 and 6 of the platform door 2 are slid in the approaching direction to close the opening 5.

  On the other hand, when the passenger 8 does not exist in the boarding passage 9 when the distance sensor 11 first scans the light into the boarding path 9, the distance measured by the distance sensor 11 The reference distances coincide with each other in the entire scanning region X, and the control unit 27 determines that there is no passenger 8 in the scanning region X. Therefore, a warning signal is not output by the control unit 27, and the entrance / exit door of the train 7 and the opening 5 of the platform door 2 are closed in the same manner as described above.

  As described above, according to the safety device 10 according to the present embodiment, light is scanned on the floor surface of the entrance / exit passage 9 by the light projection mirror 14 of the distance measuring sensor 11, so that the sliding door of the platform door 2 is temporarily assumed. Even in the state in which 6 and 6 are opened, the presence / absence of the passenger 8 in the boarding passage 9 can be accurately determined. Further, since the distance measuring sensor 11 includes a light projecting mirror 14 for scanning light, and a single distance measuring sensor 11 scans light over a wide range of the getting-on / off passage 9, the number of distance measuring sensors 11 installed Even if it is reduced, it is possible to accurately determine the presence / absence of passengers in the passage 9 for getting on and off.

  The safety device according to the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, the control unit 27 may be configured to detect the shape and size of a reflection part such as the passenger 8 based on the measurement distance detected by the distance measuring sensor 11. Specifically, when the passenger 8 is present in the scanning area X, the reference distance is set in a continuous area corresponding to the size of the passenger 8 in the scanning area X by scanning the distance measuring sensor 11. It cannot be detected. Therefore, if it is determined how long a region in which the reference distance is not detected is determined, it is possible to determine the size and shape of the reflection part. In this way, it is possible to more accurately determine the presence / absence of the passenger 8 without erroneously detecting a minute reflection site such as dust existing in the scanning region X as the passenger 8.

  In the above embodiment, the reference line Y is formed at the end portion 9a of the getting-on / off passage 9. However, when the train 7 stops on the platform 1, as shown in FIG. When the platform clearance adjustment member 30 that protrudes from the end portion 9a of the train 9 toward the train 7 side and closes the clearance between the train 7 and the passage 9 for getting on and off is provided on the platform 1, the platform clearance adjustment member You may make it form a reference line in the edge part 30a of 30 train travel paths 3 side (train 7 side).

  Furthermore, the arrangement | positioning location and arrangement | positioning number of the ranging sensor 11 are not specifically limited. For example, as shown in FIG. 5, a plurality of, for example, two distance measuring sensors 11, 11 may be arranged on the wall surface of the fixed walls 4, 4 on the boarding passage 9 side with the opening 5 therebetween. Alternatively, as shown in FIG. 6, a plurality of, for example, two distance measuring sensors 11, 11 may be arranged at intervals in the height direction of the fixed wall 4.

  Further, the distance measuring sensor that can be used in the present embodiment is illustrated in FIG. 3 as long as it is provided with a scanning unit that scans light at a fixed position (for example, equivalent to the light projection mirror 14 in FIG. 3). It is not limited to the distance measuring sensor 11. For example, a sensor as shown in FIG. 7 may be used as a distance measuring sensor. In FIG. 7, components common to the distance measuring sensor 11 are denoted by the same reference numerals. The distance measuring sensor 11 ′ is different from the distance measuring sensor 11 in that a half mirror 40 is provided and a part of the optical path of the light projecting unit 12 and the light receiving unit 13 is partially shared, so that a light projecting mirror is provided. 14 also serves as the light receiving mirror 15 (see FIG. 3).

  More specifically, as shown in FIG. 7, the distance measuring sensor 11 ′ includes, as a basic configuration, a light projecting unit 12, a light receiving unit 13, and a rotating body 16 ′ to which a light projecting mirror 14 is attached. Half mirror 40. And the light radiate | emitted from the light projection part 12 is reflected upward by the half mirror 40, after radiate | emitting in the left-right direction in a figure. The light reflected upward by the half mirror 40 is shaped by the optical lens 19 so that the beam diameter is constant, and then the drive unit 20 is centered on the optical axis Z ′ of the light reflected upward by the half mirror 40. The light is reflected by a light projecting mirror 14 attached to a rotating body 16 ′ that is rotationally driven by “and is scanned in the surrounding space around the rotation axis of the light projecting mirror 14. On the other hand, the light reflected by the reflection part in the scanning region of the light formed in the surrounding space by the rotation of the light projecting mirror 14 is reflected again by the light projecting mirror 14 and then converged by the optical lens 19. The light passes through the half mirror 40 and is focused on the light receiving unit 13 as an image.

It is a schematic perspective view which shows the platform door to which the safety device which concerns on one Embodiment of this invention was attached. It is a schematic side view which shows the platform door to which the safety device which concerns on this embodiment was attached. It is the figure which illustrated the concrete composition of the safety device concerning this embodiment. It is a figure which shows the modification which concerns on this embodiment. It is a figure which shows the modification which concerns on this embodiment. It is a figure which shows the modification which concerns on this embodiment. It is a figure which shows the modification which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Platform 2 Platform door 3 Train travel path 4 Fixed wall 5 Opening part 6 Sliding door 7 Train 8 Passenger passenger 9 Passage 9a End part 10 Safety device 11 Distance sensor 12 Light projecting part 13 Light receiving part 14 Light projection mirror 15 Light receiving mirror 16 Rotating body 17 Distance calculating unit 18 Rotating position detecting unit 19 Optical lens 20 Driving unit 21 Light receiving lens 27 Control unit X Scanning region Y Reference line

Claims (6)

A platform door safety device for judging whether or not there is a passenger in a boarding / alighting path between a platform door provided in the platform and an end of the platform,
At a fixed position, a distance sensor that scans light onto the floor surface of the boarding passage and receives reflected light from within the scanned area and detects a distance to the reflected portion, the distance sensor, Detecting the measurement distance obtained when the reflected light from the scanned region is received, with the measurement distance to the reference line formed on the floor surface of the boarding passage by the scan as a reference distance,
A platform door safety device configured to determine the presence / absence of the passenger based on a difference between a measurement distance detected by the distance measuring sensor and the reference distance.   2. The platform door safety device according to claim 1, wherein the distance measuring sensor includes a rotating mirror that scans light on a floor surface of the boarding passage. 3. The reference line is formed at an end of the boarding passage,
3. The platform door safety device according to claim 1, wherein the distance measuring sensor is disposed closer to the platform door than the reference line. 4. The reference line is formed on a platform gap adjusting member that closes a gap between the end of the platform and the train, and
3. The platform door safety device according to claim 1, wherein the distance measuring sensor is disposed closer to the platform door than the reference line. 4.   The distance measuring sensor is disposed such that a scanning surface of the light is inclined with respect to a floor surface of the getting-on / off passage, and the reference line is placed on the floor surface of the getting-on / off passage along the longitudinal direction of the platform. The platform door safety device according to any one of claims 1 to 4, wherein the platform door safety device is formed linearly.   The warning signal is output when it is determined that the passenger is present based on the difference between the measurement distance detected by the distance measuring sensor and the reference distance. The platform door safety device according to any one of -5.

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